/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePresenceInterface.h
EOnlinePresenceState from the string passed in
namespace EOnlinePresenceState { [EOnlinePresenceState::Type](API\Plugins\OnlineSubsystem\Interfaces\EOnlinePresenceState__Type) EOnlinePresenceState::FromString ( const TCHAR * StringVal ) }